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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright 2014-2022 Pierre Ossman for Cendio AB
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <rdr/InStream.h>
#include <rdr/MemInStream.h>
#include <rdr/OutStream.h>
#include <rfb/Exception.h>
#include <rfb/ServerParams.h>
#include <rfb/PixelBuffer.h>
#include <rfb/RREDecoder.h>
using namespace rfb;
RREDecoder::RREDecoder() : Decoder(DecoderPlain)
{
}
RREDecoder::~RREDecoder()
{
}
bool RREDecoder::readRect(const Rect& /*r*/, rdr::InStream* is,
const ServerParams& server, rdr::OutStream* os)
{
uint32_t numRects;
size_t len;
if (!is->hasData(4))
return false;
is->setRestorePoint();
numRects = is->readU32();
os->writeU32(numRects);
len = server.pf().bpp/8 + numRects * (server.pf().bpp/8 + 8);
if (!is->hasDataOrRestore(len))
return false;
is->clearRestorePoint();
os->copyBytes(is, len);
return true;
}
void RREDecoder::decodeRect(const Rect& r, const uint8_t* buffer,
size_t buflen, const ServerParams& server,
ModifiablePixelBuffer* pb)
{
rdr::MemInStream is(buffer, buflen);
const PixelFormat& pf = server.pf();
switch (pf.bpp) {
case 8: rreDecode<uint8_t >(r, &is, pf, pb); break;
case 16: rreDecode<uint16_t>(r, &is, pf, pb); break;
case 32: rreDecode<uint32_t>(r, &is, pf, pb); break;
}
}
template<class T>
inline T RREDecoder::readPixel(rdr::InStream* is)
{
if (sizeof(T) == 1)
return is->readOpaque8();
if (sizeof(T) == 2)
return is->readOpaque16();
if (sizeof(T) == 4)
return is->readOpaque32();
}
template<class T>
void RREDecoder::rreDecode(const Rect& r, rdr::InStream* is,
const PixelFormat& pf,
ModifiablePixelBuffer* pb)
{
int nSubrects = is->readU32();
T bg = readPixel<T>(is);
pb->fillRect(pf, r, &bg);
for (int i = 0; i < nSubrects; i++) {
T pix = readPixel<T>(is);
int x = is->readU16();
int y = is->readU16();
int w = is->readU16();
int h = is->readU16();
if (((x+w) > r.width()) || ((y+h) > r.height()))
throw Exception ("RRE decode error");
pb->fillRect(pf, Rect(r.tl.x+x, r.tl.y+y, r.tl.x+x+w, r.tl.y+y+h), &pix);
}
}
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